Questions tagged [supernova]

Questions regarding stars which increase suddenly in energy output due to an explosion which ejected much of its mass.

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If a supernova explodes all it's comets into space, can they reach a big number of star systems?

If there's DNA life that arises on a warm planet 2 billion years after the big bang, and meteorite collisions on the planet propagate DNA unicellular organisms into millions of icy rocks orbiting the ...
5 votes
1 answer
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How does metallicity reduce the likelihood of black hole formation?

Large stars collapse and if they are large enough form black holes. But the likelihood reduces with metallicity. What mechanism facilitates this? I believe it has something to do with opacity and ...
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Do pop III stars undergo supernova or direct collapse?

Population III stars were the first stars to form. They are hypothesised as being very massive, i.e., > 100 M$_{\odot}$. My question regards how do these stars end their lives? An old orthodoxy for ...
28 votes
2 answers
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When stars explode after running out of fuel, why are new stars born from the remnants?

I'm not a physicist or have a very good physics background but I've often wondered why there are new stars that are born in the nebula which was created after the parent star has exploded. As I ...
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Acronyms in astrophysics: is there a place that collects them all anywhere on the internet? And what does PSN mean on the TNS server?

Acronyms in astrophysics: is there a place that collects them all anywhere on the internet? And what does PSN mean on the TNS server? Is it "possible supernova" or "pulsar" ...
2 votes
1 answer
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Do supernova remnant nebula re-collapse into a star?

We know that nebula sometimes collapse into stars. The particles are attracted to the joint gravitational center of the whole nebula. One type of nebula is a supernova remnant nebula. Unlike a normal ...
2 votes
1 answer
61 views

What criteria determines whether stars are supernova type II candidates?

I want to find supernova candidates by using the Gaia catalog in 300 parsec (near Earth). I though they must be red super giants so they are cooler than 4100 K and more luminous than 104 solar ...
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2 votes
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Should we fear Wolf-Rayet WR-104?

I've read on Quora about Wolf-Rayet binary star WR-104, which is thought to be a precursor to a supernova explosion with two accompannying gamma ray bursts. It looks as if the rays will travel in our ...
1 vote
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Which parameters of stars could show they about to undergo a supernova explosion?

I need to seek stars in our galaxy about to undergo a SN from catalogues. I can find stars in our galaxy by setting parallax to a certain value. However, I don't know how to find a parameter which ...
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Wouldn't the 1054 supernova have temporarily enlightened the Earth like the Sun?

The peak luminosity of all type Ia supernovae is 1.60×1036 Watts. If we see a star go supernova from earth, and we observe its intensity to be 1.0 W/m2. The intensity of the Sun is about 6.33x107 W/m2....
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When did our neutrino detectors become sensitive enough to detect supernovas in the core of the Milky Way?

When did our neutrino detectors become sensitive enough to be able to detect supernovas occurring in the Core of the Milky Way galaxy? I know the answer is well before 1987, because we detected the ...
4 votes
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When's the most recent time that we could have missed a supernova?

I know that if a supernova were to happen in the galactic Core, the dust there would prevent the visible light from it from reaching us, so if one were to have occurred there in say 1900, we wouldn't ...
2 votes
1 answer
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How bright would Betelgeuse's supernova appear?

Popular science articles suggest that when Betelgeuse goes supernova, for some days it would appear as bright as the full moon. But I have no intuition about a celestial point source that bright. ...
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What happens if supernova undergoes in tightly close multi stars system

I do wonder in a tight or close orbital binary stars or multi stars system, if one stars undergoes supernova and that blast can lead another stars in the system to become supernova, too? Is there ...
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1 answer
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Do “neutrino supernovae” exist?

Core collapse supernovae release most of their energy in the form of neutrinos. About 1% of the neutrinos are absorbed by the thick outer envelope which powers a spectacular supernova explosion. Core ...
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When will be the next visible Supernova? [duplicate]

I tried to estimate the average time between Supernovas. Here is my amateur attempt: For a Supernova to be seen to the naked eye it should be, I believe, in our Galaxy. (even if not, lets assume that)...
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Why haven’t we observed supernova events of the hypothetical population III stars?

It’s said that we haven’t observed any population III stars because these stars are too far away, which makes them too dim to observe via small diameter space telescopes. Their light is also extremely ...
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1 answer
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Metallicity in gravitational wave astronomy

Metallicity relates to the quantity of elements in an object that are heavier than hydrogen and helium. I often see this terminology in recent studies of gravitational waves such as this paper. If I ...
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Are Superluminous supernova and Hypernova the same thing?

Are Superluminous supernova and Hypernova the same thing? Is there any difference with their formation, luminosity etc?
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1 answer
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Flashes in the Sky

Short Version: went camping into a very dark, remote location with clear air, no moon. Was able to see everything from the Pleiades and Orion, to the Southern Cross and the Magellanic Clouds (I live ...
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1 answer
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How to calculate distance to other galaxies using type 1a supernova?

This is for a project in astronomy with extensive data analysis. How should I calculate the distance of galaxies using AGN and supernova Ia? I am using the data from dr17 of SDSS.
6 votes
1 answer
109 views

The two channels of Type Ia SNe and their use as standard candles

As we know, Type Ia supernovae are used as standard candles since their absolute luminosities are expected to be roughly constant. The consensus model, as seen from the Wikipedia page, suggests this ...
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What is the relation between size (radius) of an astronomical object and the speed of oscillation of 'light' coming from it? (Strength/amplitude)?

From the year-end issue of New Scientist Magazine (Dec. 18-31,2021): Astronomy: 'Space Cow' explosion was probably a failed supernova' Page 10: 'They found that the strength of this radiation ...
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Why are type 1b and type 1c supernovae called type 1 rather than type 2; if they result from large exploding stars, rather than accreting dwarfs?

What similarities do types Ib and Ic supernovae have in common with type 1a? Are their spectra or their magnitudes more similar to accreting white dwarfs than the other supermassive, main sequence, ...
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4 votes
0 answers
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Type Ia supernova by fallback?

Is it possible for a massive star of more than 1.4 solar masses (probably around 3 or more but below the threshold for type II) to collapse into a white dwarf and a planetary nebula, then go supernova ...
1 vote
1 answer
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Why is the carbon/oxygen ratio at low metallicities important to study?

Oxygen and carbon are the most abundant elements in the Universe (formed via stellar nucleosynthesis), following only hydrogen and helium (formed via the Big Bang). There seems to be a lot of work to ...
2 votes
1 answer
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How come a "failed supernova" is, well, "failed"?

I heard about this a while ago but recently came back to it: https://en.wikipedia.org/wiki/Failed_supernova which suggests that basically what this is is something where a star is so big and heavy ...
2 votes
0 answers
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Cosmology context plotting : Covariance matrix - Script to plot Omega_m vs Omega_Lambda diagram in Python

I have covariance matrices and Markov chains coming from the SCP (Supernova Cosmology Project) and I would like to plot all these data in the particular diagram Omega_Lambda vs Omega_m or w vs Omega_m....
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1 answer
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Effects of a supernova shockwave or gravitational wave to a nearby planet's orbit?

I've been reading about recent reports regarding COCONUTS-2B, a planet with the longest orbital period known - 1.1 million years. As a previous question asked, What precisely leads to planets like ...
4 votes
2 answers
165 views

Can we estimate the number of stars which have died in the observable universe?

We know there are currently between 10^22 and 10^24 stars in the observable universe, but can we make an estimate of how many stars have died so far? Or, in other words, how many supernovæ have taken ...
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How can we know if a star which is visible in our night sky goes supernova?

Let's say there is a star about 3000 light-years away from earth visible in our night sky. If this star were to go supernova tomorrow(not relative to earth's night sky), we would know about it 3000 ...
4 votes
1 answer
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How does pair production cause a pair-instability supernova instead of leading to the formation of a black hole?

The Wikipedia article on pair-instability supernovas (PISNs) doesn't seem to give a very good explanation of what causes a PISN. My understanding of the process it describes is this: Once the core ...
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Procedure to construct a spectral energy distribution and bolometric light curve of supernovae?

Can anyone check the logic of this proposed workflow and/or point me in the direction of a guide and example to check my work? Proposed procedure to construct a spectral energy distribution and ...
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Do all C-O white dwarfs have more-or-less the same proportions of carbon and oxygen?

Type 1a supernovae are known for having very consistent energy yields, and they are caused when a carbon-oxygen white dwarf reaches the Chandrasekhar limit of about 1.4 solar masses. Since type 1a ...
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1 vote
2 answers
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What does an electron-capture supernova leave behind? A white dwarf, a neutron star or nothing?

Somehow, none of the many articles I've read about the recent discovery of electron-capture supernovae has specifically said what they leave behind as remnants.....
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4 votes
1 answer
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Infall velocity in core-collapse supernovae

In this article Neutrino Transport in core-collapse supernovae, in the description of core-collapse supernova mechanism, it is stated that The velocity of infalling matter in the core increases as we ...
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12 votes
1 answer
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Is oxygen an alpha element?

Type II (core-collapse) supernovae occur shortly after star formation and enrich a galaxy with $\alpha$ elements such as O, C, NE, Mg, Ca and Si. On the other hand, Type Ia supernovae occur on a more ...
4 votes
1 answer
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Difference between Supernova Type Ia and Nova

What is the difference between Supernova Type Ia and Nova? Base on a web search, they seem to have a similar formation process, as they are both white dwarfs in a binary system who absorb masses from ...
1 vote
3 answers
293 views

Why is so much energy released in a supernova while so little in a star?

There is a huge amount of energy released in a supernova. All fuel is used almost instantaneously. Why doesn't this happen in stars (like the sun)? I am asking "Why does a large star spend ...
2 votes
1 answer
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Nearby galaxy distances

Type Ia supernovae are extremely useful in measuring the distance of remote galaxies. It is known that type Ia supernovae always reach the same brilliance at their peak. Like Cepheid variables, they ...
6 votes
1 answer
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Missing supernovae in the Milky Way

Stars with more than 8-16 solar masses usually go supernova. These are OB stars, of which 0.2% currently exist in our galaxy. The average lifespan of said star ranges from 10 to 40 million years. So ...
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How loud would a supernova, kilonova, and hypernova be? [closed]

If we could hear the sounds of these explosions directly where it was happening, how loud would each of these events be?
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3 answers
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Were there any images of Sanduleak -69 202 (progenitor of SN1987A) before it exploded?

We all know about SN1987A, the closest observed supernova since Kepler's time. Its progenitor was Sanduleak -69 202, a magnitude 12 blue supergiant, catalogued in 1970. Were there any images of this ...
4 votes
1 answer
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Long-lived supernova remnants?

We cannot see the supernova remnant of the star that triggered the formation of the Sun and the Solar System, as the remnant dispersed and became mixed into the interstellar medium. So I am wondering, ...
2 votes
1 answer
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Why does this nucleogenesis table not label s and r-processes for all elements (not-labmade) past Fe?

I'm reviewing nucleogenenesis and came across the table below. I like it because it actually labels the s and r-process elements, but I became confused as to why the neutron capture processes begin at ...
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3 votes
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Uranium accumulating inside a White Dwarf?

A couple of days ago, there was news that "Some dead stars may harbor enough uranium to set off a thermonuclear bomb", which is basically a teaser for Actinide crystallization and fission ...
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1 vote
1 answer
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How do black holes form from stars that go supernova

I know that the cores of stars with more than 20 times the mass of the Sun collapse into black holes at the end of the star’s life. However, as far as my understanding goes, stars with cores that ...
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3 votes
2 answers
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How are shockwaves in a star that cause supernova created

I know that during the collapsing of a star 8 times the mass of the Sun at the end of its life, a shockwave is generated that blows the star up. However, I do not understand how it is exactly ...
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2 votes
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What would happen if a neutron star merged with a white dwarf?

We've heard of neutron star mergers and white dwarf mergers. But what would result in a neutron star merging with a white dwarf? Would there be a similar super/kilonova, are there any examples of it, ...
4 votes
1 answer
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Can a star be massive enough to go 'supernova' yet not be massive enough to leave behind a neutron star? Or, perhaps vice versa?

From what I understand, stars that explode as a supernova at the end of their lives become either a black hole or a neutron star, and less massive stars that do not explode become white dwarves, but......
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